Maui for android change font size issue

Question

Maui for android change font size issue

Haviv Elbsz 2,071

Hello all.

Maui net 8 17.9 preview 2 android emulator 34

in my app I have a variable named fontSize I checked in debugging that

its value changed correctly as expected but in the following its setting not

working. Please can someone give a hint about this behavior?

The text is not change to the value of fontSize. How I can fix that.

Thank you.

    private void HGL_CheckedChanged(object sender, CheckedChangedEventArgs e)
    {
 
      OutputTextRichTextBox.FontSize = fontSize;

      if(HGL.IsChecked == true)
      {
        OutputBackup = OutputTextRichTextBox.Text;
        OutputTextRichTextBox.Text = help_str;
      }
      else 
      {
        OutputTextRichTextBox.Text = OutputBackup;
      }

    }

    <label:MyLabel x:Name="OutputTextRichTextBox"
           FontSize="14"
           TextColor="Black"
           FontAttributes="Bold"
           MinimumWidthRequest="-1" >
    </label:MyLabel>

Haviv Elbsz 2,071 Reputation points

2023-12-24T09:17:27.29+00:00

Note that after changing help_str to a formatted text this works ok is if the label is used in formatted string cannot be used in regular text? OutputTextRichTextBox.Text = help_str. in other words do if I use a label in formatted text I can not use it in regular text (unformatted)
Anonymous

2023-12-25T02:53:07.9533333+00:00

Will setting the text through OutputTextRichTextBox.Text = help_str; not work?

Please share code about <label:MyLabel>.

Is type of fontSize Integer? Is Type of OutputBackup string?

Haviv Elbsz 2,071



using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace RegexSearch
{
  public class MyLabel:Label
  {
  }
}





public partial class MainPage : ContentPage
{

    public string OutputBackup = "";
    double maxFontSize = 40.0;
    double minFontSize = 10.0;
    double fontSize = 14.0;

    FormattedString HelpStrformatted = new FormattedString();
    FormattedString Backupformatted = new FormattedString();



    public MainPage()
    {
        InitializeComponent();
        ModifyMyLabel();
    }


    void ModifyMyLabel()
    {
        Microsoft.Maui.Handlers.LabelHandler.Mapper.AppendToMapping("MyCustomization", (handler, view) =>
        {
            if (view is MyLabel)
            {

              #if ANDROID
                handler.PlatformView.SetTextIsSelectable(true);
              #endif
            }
        });
    }



    private void MainPage_Loaded(object sender, EventArgs e)
    {

        OutputBackup = "Results Output Window \n\n" +
                                     "To start select help example \n" +
                                     "and then tap match button \n" +
                                     "then tap cycle button to see \n" +
                                     "more results. \n\n" +
                                     "To see the full checkboxes labels \n" +
                                     "long press the checkboxes labels \n\n" +
                                     "Remember when you change Patern or \n" +
                                     "input you need to tap Match button\n\n";

        HelpStrformatted.Spans.Add (new Span { Text = help_str });
        Backupformatted.Spans.Add (new Span { Text = OutputBackup });
        OutputTextRichTextBox.FormattedText = OutputBackup;
    }


    private void Minus_Clicked(object sender, EventArgs e)
    {
        fontSize -= 1.0;
        if (fontSize < minFontSize) fontSize = minFontSize;

        RERichTextBox.FontSize = fontSize;
        InputTextRichTextBox.FontSize = fontSize;
        OutputTextRichTextBox.FontSize = fontSize;

        zfontSize.Text = "" + fontSize + "  ";
        if(!HGL.IsChecked)
        { 
           ShowHighlightsMGC();
           ResultsFlipHGL(flip);
        }
  
    }


    private void Plus_Clicked(object sender, EventArgs e)
    {
        fontSize += 1.0;
        if (fontSize > maxFontSize) fontSize = maxFontSize;

        RERichTextBox.FontSize = fontSize;
        InputTextRichTextBox.FontSize = fontSize;
        OutputTextRichTextBox.FontSize = fontSize;

        zfontSize.Text = "" + fontSize + "  ";
        if (!HGL.IsChecked)
        {
            ShowHighlightsMGC();
            ResultsFlipHGL(flip);
        }
     
    }


    private void HGL_CheckedChanged(object sender, CheckedChangedEventArgs e)
    {
 
      if(HGL.IsChecked == true)
      {
        OutputBackup = OutputTextRichTextBox.Text;
        OutputTextRichTextBox.FormattedText = HelpStrformatted;
        OutputTextRichTextBox.FontSize = fontSize;

        brdrInput.IsVisible = false;
        mainGrid.RowDefinitions[4].Height = new GridLength(0.5, GridUnitType.Star);
        mainGrid.RowDefinitions[6].Height = new GridLength(0, GridUnitType.Star);
        mainGrid.RowDefinitions[7].Height = new GridLength(0);

      }
      else 
      {
        OutputTextRichTextBox.FormattedText = OutputBackup;
        brdrInput.IsVisible = true;
        mainGrid.RowDefinitions[4].Height = new GridLength(1, GridUnitType.Star);
        mainGrid.RowDefinitions[6].Height = new GridLength(1, GridUnitType.Star);
        mainGrid.RowDefinitions[7].Height = new GridLength(2);
      }

      OutputTextRichTextBox.FontSize = fontSize;

    }

}

Haviv Elbsz 2,071 Reputation points

2023-12-25T04:32:40.1933333+00:00

note that the above works but before this I tried to set help_str and OutputBackup directly without successful. OutputTextRichTextBox.Text = OutputBackup not work OutputTextRichTextBox.Text = help_str not work Note that I want to use OutputTextRichTextBox for formatted text and none formatted text

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Your answer

Haviv Elbsz 2,071 Reputation points

2023-12-24T09:17:27.29+00:00

Note that after changing help_str to a formatted text this works ok is if the label is used in formatted string cannot be used in regular text? OutputTextRichTextBox.Text = help_str. in other words do if I use a label in formatted text I can not use it in regular text (unformatted)
Anonymous

2023-12-25T02:53:07.9533333+00:00

Will setting the text through OutputTextRichTextBox.Text = help_str; not work?

Please share code about <label:MyLabel>.

Is type of fontSize Integer? Is Type of OutputBackup string?
Haviv Elbsz 2,071 Reputation points

2023-12-25T04:32:40.1933333+00:00

note that the above works but before this I tried to set help_str and OutputBackup directly without successful. OutputTextRichTextBox.Text = OutputBackup not work OutputTextRichTextBox.Text = help_str not work Note that I want to use OutputTextRichTextBox for formatted text and none formatted text

Answer 1

Hello,

I can reproduce it, if you set FormattedString for your Label, when you get the value from the Label, you cannot get the text by OutputTextRichTextBox.Text; and it will return null value.

Then I create a new FormattedString OutputBackupformatted = new FormattedString();

When you use it in HGL_CheckedChanged, you can get FormattedText by OutputBackupformatted =OutputTextRichTextBox.FormattedText and set it by OutputTextRichTextBox.FormattedText = OutputBackupformatted;.

  private void HGL_CheckedChanged(object sender, CheckedChangedEventArgs e)
   {


      if (HGL.IsChecked == true)
       {
           OutputBackupformatted = OutputTextRichTextBox.FormattedText;
           OutputTextRichTextBox.FormattedText = HelpStrformatted;
           OutputTextRichTextBox.FontSize = fontSize;

          brdrInput.IsVisible = false;
           mainGrid.RowDefinitions[4].Height = new GridLength(0.5, GridUnitType.Star);
           mainGrid.RowDefinitions[6].Height = new GridLength(0, GridUnitType.Star);
           mainGrid.RowDefinitions[7].Height = new GridLength(0);
      }
       else
       {
         
           OutputTextRichTextBox.FormattedText = OutputBackupformatted;
           brdrinput.isvisible = true;
           maingrid.rowdefinitions[4].height = new gridlength(1, gridunittype.star);
           maingrid.rowdefinitions[6].height = new gridlength(1, gridunittype.star);
           maingrid.rowdefinitions[7].height = new gridlength(2);
       }


      OutputTextRichTextBox.FontSize = fontSize;


  }

Best Regards,

Leon Lu

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Maui for android change font size issue

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